test/py: Add tests for LZO and ZSTD

Improve SquashFS tests architecture. Add 'Compression' class. LZO
algorithm may crash if the file is fragmented, so the fragments are
disabled when testing LZO.

Signed-off-by: Joao Marcos Costa <joaomarcos.costa@bootlin.com>

test/py/tests/test_fs/test_squashfs/sqfs_common.py

@@ -5,6 +5,7 @@
 import os
 import random
 import string
+import subprocess
 
 def sqfs_get_random_letters(size):
     letters = []
@@ -19,24 +20,57 @@ def sqfs_generate_file(path, size):
     file.write(content)
     file.close()
 
-# generate image with three files and a symbolic link
-def sqfs_generate_image(cons):
-    src = os.path.join(cons.config.build_dir, "sqfs_src/")
-    dest = os.path.join(cons.config.build_dir, "sqfs")
-    os.mkdir(src)
-    sqfs_generate_file(src + "frag_only", 100)
-    sqfs_generate_file(src + "blks_frag", 5100)
-    sqfs_generate_file(src + "blks_only", 4096)
-    os.symlink("frag_only", src + "sym")
-    os.system("mksquashfs " + src + " " + dest + " -b 4096 -always-use-fragments")
+class Compression:
+    def __init__(self, name, files, sizes, block_size = 4096):
+        self.name = name
+        self.files = files
+        self.sizes = sizes
+        self.mksquashfs_opts = " -b " + str(block_size) + " -comp " + self.name
 
-# removes all files created by sqfs_generate_image()
-def sqfs_clean(cons):
-    src = os.path.join(cons.config.build_dir, "sqfs_src/")
-    dest = os.path.join(cons.config.build_dir, "sqfs")
-    os.remove(src + "frag_only")
-    os.remove(src + "blks_frag")
-    os.remove(src + "blks_only")
-    os.remove(src + "sym")
-    os.rmdir(src)
-    os.remove(dest)
+    def add_opt(self, opt):
+        self.mksquashfs_opts += " " + opt
+
+    def gen_image(self, build_dir):
+        src = os.path.join(build_dir, "sqfs_src/")
+        os.mkdir(src)
+        for (f, s) in zip(self.files, self.sizes):
+            sqfs_generate_file(src + f, s)
+
+        # the symbolic link always targets the first file
+        os.symlink(self.files[0], src + "sym")
+
+        sqfs_img = os.path.join(build_dir, "sqfs-" + self.name)
+        i_o = src + " " + sqfs_img
+        opts = self.mksquashfs_opts
+        try:
+            subprocess.run(["mksquashfs " + i_o + opts], shell = True, check = True)
+        except:
+            print("mksquashfs error. Compression type: " + self.name)
+            raise RuntimeError
+
+    def clean_source(self, build_dir):
+        src = os.path.join(build_dir, "sqfs_src/")
+        for f in self.files:
+            os.remove(src + f)
+        os.remove(src + "sym")
+        os.rmdir(src)
+
+    def cleanup(self, build_dir):
+        self.clean_source(build_dir)
+        sqfs_img = os.path.join(build_dir, "sqfs-" + self.name)
+        os.remove(sqfs_img)
+
+files = ["blks_only", "blks_frag", "frag_only"]
+sizes = [4096, 5100, 100]
+gzip = Compression("gzip", files, sizes)
+zstd = Compression("zstd", files, sizes)
+lzo = Compression("lzo", files, sizes)
+
+# use fragment blocks for files larger than block_size
+gzip.add_opt("-always-use-fragments")
+zstd.add_opt("-always-use-fragments")
+
+# avoid fragments if lzo is used
+lzo.add_opt("-no-fragments")
+
+comp_opts = [gzip, zstd, lzo]